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HVAC control Firmware development

The purpose of this document is to define the requirements for a new firmware development of a Control Interface for HVAC units.

This interface acts as a MODBUS slave interface, at fixed speed (115.200bps)

There are 4 modbus registers to identify the model, type, serial number and the modbus address. Modbus address can be modified for the master, but only applies after a Reset. Default address is 1.

There is also a fixed broadcast address 255 for master commands, no answer is required.

There are also 4 registers more: 3 for operation and 1 for status & alarm code:

There are two PCB designs: one for BASIC or WATER HVAC unit and the other for ELECTRIC HVAC unit, so there are 3 different firmware:

1) BASIC HVAC UNIT:

a. Switch ON AC supply when all is ok, switch off in case of alarm

b. Fan speed control: low / fast / stop (2 digital lines). Very important: changes in speed must be synchronized with ZCD input signal

c. ZCD signal control, corresponding to AC line frequency. Alarm if it’s out of normal range (50/60 Hz)

d. 2 input digital signals & 1 output signal for users app.

e. 1 PTC1000 temperature sensor, for user info

f. Led Indicator Status/Alarm: fast blink during communication and slow blink for alarm codes.

2) WATER HVAC UNIT:

The same than 1) but adding EV relay digital output signal

3) ELECTRIC HVAC UNIT:

The same than 1) but adding Heat Control system:

a. 3 output signals for control 3-stage heater. Heater cannot switch on if fan is stopped. Heater stage can be selected as function of fan motor speed and model/type, following the next table:

Speed Max heater

OPT 1000 9kW Max heater

(Other)

Stopped 0 (no heater) 0 (no heater)

Low 2 3

High 3 3

b. Overheat sensor (NO) digital input. Generate alarm & increase fan speed every 2 minutes. After this, Heater must be stopped. When overheat signal disappears, heater must be restored to the programmed stage.

• PLANNING & MILESTONES

2 hardware units supplied: BASIC/WATER CONTROL INTERFACE and ELECTRIC CONTROL INTERFACE, to be used as for debugging the new firmware design, with a programmer tool for ST8M family microcontrollers

Proposal phases / milestones of firmware project:

1) “Hello World” STM8 and peripherals (UART)

2) SLAVE MODBUS communication protocol

3) Basic/Water control interface firmware design

4) Electric control interface firmware design

• SKILLS

REQUIRED (mandatory):

• Firmware

• embedded systems

• c programming

Evner: Firmware, Elektronik, C programmering, Embedded Systems, Indbygget Software

Om arbejdsgiveren:
( 13 bedømmelser ) Castellar del Vallès, Spain

Projekt ID: #22321135

73 freelancere byder i gennemsnit €4731 på dette job

sagradoamicus

Hi I am experienced embedded system designer with more than 15 years of experience. I have the details of project and have a few questions to discuss before I can give you my final quote. Please get in touch if you ar Flere

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chandra2sekhar

Hello,Myself [login to view URL] Sekhar,[login to view URL],Phd from Cdeec Innovations,[login to view URL] have 15+ years experience in Electronics Product development. we have in house pcb fabrication facility for protoypes.i have worked on many IO Flere

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ppgjsc

Hi. I am very familiar for firmware and electric control and I have made them before. I have a rich experience of design and simulation about RF and electronic circuit using vivado sdk Cadence , Altium, ADS, HFSS ,CST Flere

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DreamCha

Thanks for sharing your project. I'm fully read the description, so that, I'm very interested to this project. As I'm a Senior Embedded System engineer, I have rich experiences in many embedded systems development, Flere

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shahbaz1980

Hi There, I am representing I-TECH. We have 15 years of R&D and customized electronics prototyping experience. We will write the firmware as described in the project post. If it is required to test the firmware, we Flere

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xiaoqideng

Hi, how are you? Thanks for your project. I've read your description carefully, and I'm very interested in your job. I have been developing many firmwares for 10+ years. Please have a look at my profile, then you will Flere

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NewFuture338

ello, I like the way you describe this project post. First of all I have been dealing with ST Microcontroller (STM32) since 2011, moving to STM8 isn't a big deal for me. I also Hardware design engineer who could desig Flere

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oobretenov

very interesting project. which IDE need to be use for development?

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kenb080

Hello, I have read your project details carefully and would like to discuss my skills and plans with you. I am a c / c++ expert and have been developing and experimenting with it for 14 years. Great things come from Flere

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PSZJVC

Hello! I have read your description and so much interested in your project. I have great experience from device design to production and firmware development for 15 years I know well modbus [login to view URL] Flere

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jokanies

Hi, I have rich experiences with PCB design and micro controller firmware development for 7 years. I am familiar with Arduino, ESP, NRF, stm32 and Raspberry pi. I am available to begin immediately and would like to lea Flere

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ahmad5857

Hi Sir, We are expert in MODBUS protocol on RS485. We are very expert in industrial control. lets talk to us on this project. We are professional engineers and developers who do such projects from the last 10 years. Flere

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CoherentTech123

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arrijal1992

Hello, I like the way you describe this project post. First of all I have been dealing with ST Microcontroller (STM32) since 2011, moving to STM8 isn't a big deal for me. I also Hardware design engineer who could desi Flere

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ob100

Hi, This is interesting project and perfectly matches my skills and experience: - more than 10 years of programming for embedded systems - many implementations and use of Modbus protocol - experience with motor contr Flere

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dsuclla88

Estimado señor, He leído con detenimiento su requerimientos, estoy seguro de poder realizar su proyecto, pues tengo experiencia documentada con la red MODBUS. Tengo un laboratorio completo con todo lo necesario para e Flere

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maykireos

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Programmer59

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vtlabs

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ArtShidlovskiy

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